APW7208

APW7208 1MHz, High-Efficiency, Step-Up Converter for 2 to 6 White LEDs Features General Description Wide Input Voltage from 2.5V to 6V 104mV Reference Voltage Fixed 1MHz Switching Frequency High Efficiency up to 88% 100Hz to 100kHz PWM Brightness Control Fre- quency Open-LED Protection Under-Voltage Lockout Protection Over-Temperature Protection <1µA Quiescent Current During Shutdown SOT-23-6 and TSOT-23-6 Packages Lead Free and Green Devices Available (RoHS Compliant) Applications The APW7208 is a current-mode and fixed frequency boost converter with an integrated N-FET to drive up to 6 white LEDs in series. The series connection allows the LED current to be identical for uniform brightness. Its low on-resistance of NFET and feedback voltage reduces power loss and achieves high efficiency. Fast 1MHz current-mode PWM operation is available for input and output capacitors and a small inductor while minimizing ripple on the input supply. The OVP pin monitors the output voltage and stops switching if exceeds the over-voltage threshold. An internal soft-start circuit eliminates the inrush current during start-up. The APW7208 also integrates under-voltage lockout, over-temperature protection and current limit circuits. The APW7208 is available in SOT-23-6 and TSOT-23-6 packages. White LED Display Backlighting Cell Phone and Smart Phone PDA, PMP, and MP3 Digital Camera Simplified Application Circuit Pin Configuration LX 1 GND 2 FB 3 6 VIN 5 OV...